Tool for redressing valve-seats.



H. D. SHARP.

TOOL FOR REDRESSING VALVE SEATS.

APPLICATION FILED 0012,1913.

I Attorneys Witnesses HERBERT D. similar, or SANDUSKY, onto.

TOOL FOR REDRESSIN G VALVE SEATS.

Specification of Letters Patent.

Patented June 30, 1914.

Application filed October 2, 1913. Serial No. 793,037.

f! '0 all whom it may concern:

lie it known that I, .ll'nnnnn'r I). SHARP, a citizen of the United States, residing at Sandusky, in the county of Erie and State of Ohio, have invented a new for liedressing Valve-Seats, of which the -following is a specification.

The present invention appertains to a '1 tool or implement for redressing the valve seats of globe valves, and aims to provide a novel and improved device of that character, which shall be comparatively simple, compact and inexpensive inconstruction, as well as convenient and eilicient in its use.

It is the object of the present invention to provide a suitable cutter for redressing a valve seat, and a stem for the cutter, which is designed to be passed loosely through the bonnet of the globe valve, when the usual valve stem is removed, means being provided for centering the cutter spindle Within the bonnet, and for rotatably holding the spindle in position, in order that the valve seat may be cut true.

With the foregoing general objects outlined, and with other objects in view, which will be apparent as the nature of the invention is better understood, the present invention resides inthe combination and arrangenent of parts and in the details of con- :truction hereinafter described and claimed, t being understood that changes in the prelise embodiment of the invention herein dislosed, can be made within the scope of what s claimed, without departing from the spirit f the invention.

The invention has been illustratedin its referred embodiment in the accompanying rawing, wherein the figure is a sectional iew of a globe valve, with the valve proper ad its stem removed, and with the imroved tool applied to the bonnet, parts of is present tool being shown in full, and u-ts ing shown in section. In the drawing, an ordinary type of obe valve casing 1 has been disclosed, the me embodying the valve seat '2, and the movable bonnet 3 having a bore 4 for the vssage of the valve stem, a readed upon the upper end of the bonnet 3 d having an opening 6 for the valve stem. The present tool or implement embodies a indle or stem 7 adapted to be passed isely through the bonnet and gland 5, the udle or stem 7 being, of smaller diameter LII the usual valve stem. The spindle or and useful Tool "the centering cone'15 is again The bonnet gland beingv stem 7 is threaded, as at 8, at its lower end, and a cone or centering member 9 is threadcd upon the portion 8 of the spindle, the apex of the cone 9 projecting outwardly or upwardly, and a. binding nut 10 being threaded upon the portion 8 of the stem 7 to contact with the base of the cone 9 to ock the cone in position.

The lower end of the spindle 7 is provided with a reduced threaded extension 11, upon which the cutter 12 is adapted to be threaded. This cutter may be of any convenienttype, and as illustrated includes a flat face provided with cutter teeth 13, for redressing flat valve seats, and an opposite bevel 14: which is toothed for redressing beveled valve seats, it being understood that the cutter 12 may be reversed for use in redressing either flat or beveled valve seats.

The tool also includes a second cone or centering member 15 adapted to be slidably mounted upon-the upper end portion of the spindle 7 and having a set screw 16 for locking it at any adjusted position.

A suitable hand wheel 17 is detachably carried by the upper end of the spindle 7, and it is preferable to provide a collar 18 upon the lower end of the spindle 7 against which the cutter 12 may seat.

In use, to redress the seat of 'a globe valve, the bonnet is first removed, and the valve stem is withdrawn from the bonnet, as will be readily understood. The hand wheel 17 and" the centering cone 15 are then removed from the spindle, and the upper end of the spindle is inserted upwardly through the bonnet 3 and the gland 5, in which event, slipped over the upper end of the spindle 7 and the hand wheel 17 is again attached to the spindle. 3 is then again applied to the valve casing, and the spindle 7 is moved downwardly until the cutter 12 seats upon the Valve seat 2. The centering'cone 15 is then slid downwardly until its apex fits within the opening 6 of the gland 5, in which event, the bonnet is again removed and the inner cone 9 is adjusted outwardly so as to engage within the lower end of the bore 4 of 105 e cone 15 is slid outthe bonnet. Then, th wardly slightly, for approximately one-sixteenth of an inch, and is locked in position by means of the set screw 16, the inner cone 9 being correspondingly adjusted outwardly 1 within the aga inst lonin order to center the spindle 7 bonnet and to lock the spindle 'tudinal movement, but same to rotate freely. After the nut 10 has been tightened against the cone 9, the bonnet is again threaded into engagement with the globe valve casing, and when the bonnet is one-sixteenth of an inch from home, the cutter 12 will be brought against the valve seat- 2, permitting the valve seat to be redressed by turning the spindle 7 through the medium of the hand wheel 17. seat is cut, the bonnet may be threaded 1nwardly, to work the spindle and cutter inwardly, and by continuing this operation, the valve seat may be cut down to the desired extent. Afterthe valve seat hasibeen properly dressed, the-bonnet may beremoved, and the present tool removed-from the bonnet, whic will ermit the -parts ot the valve to be assemble tor use.

'llhe resent device may be employed in connection with various globe valves andthe permitting the As the valve antennae like, it being noted that the cutter 12 is reversible to redress either flat or beveled valve seats.

Having thus described the invention, what is claimed as new is In a tool of the character described, a spindle adapted to be inserted loosely through a valve bonnet, a cutter mounted upon the lower end' of the spindle, a conical centering member adjustably mounted upon the lower end portion of the spindle and a conical centering member removably and adjustably mounted upon the upper end ortion of the spindle.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

HERBERT l). SHARP.

Witnesses:

'tnonms G. CURTIS, FRANK HARKER. 

